As someone who did my GCSE's but then moved abroad before my A Levels and ended up taking the International Baccalaureate, I'm in hindsight really glad I didn't do A Levels. Had I stayed in England I would have studied just maths, physics and chemistry. Being forced by the IB program to also study english, philosophy and economics really expanded my horizons and has been huge boon to me in my life and I'm really happy I was afforded the opportunity to do so.
I did IGCSE's (the international version as I lived in Indonesia) and AS/A levels myself, while a lot of my friends who went to a different school did IB and I generally disagree. My most hated school years were the IGCSE times, exactly because I was forced into learning about crap I didn't care about in the slightest, like English Literature when all I wanted to do was the various sciences and especially mathematics.
I feel like the IGCSE times were more than enough exposure to those other subjects to give me a reasonably well-rounded image of those subjects. Now, a decade later, I'm definitely glad I went the STEM route rather than ever touching on any humanities subjects in any amount of detail.
IGCSEs per se are a lot more flexible about that. You can do any subjects in any combination you like. Its a decision by the school to make English literature compulsory. Home educated kids often do not do it, on the other hand there are are huge number of subjects they can pick from: https://he-exams.fandom.com/wiki/Category:Subjects
British universities do often (usually?) require English language (or an equivalent) and maths (I)GCSEs, as do British employers and further education colleges etc. so its a really bad idea to skip those.
I do think its good to give kids a broad education, and for some it would be good to continue that for longer. For others (like you) its just boring.
I also think there should be more opportunities for adult education, so if you decide later in life that you would like to learn about English literature or physics or whatever you should have a chance to do it. AT the moment in the UK things seem to be going the other way, with an over expansion of universities sucking up money, and further education colleges that used to offer adult education putting the resources into "16 to 18" courses.
